Sliderule runner



i Allg. 9, 1949. E, |GNONE 2,478,547

SLIDE RULE RUNNER Filed Sept. 2, 1947 lNvENT-OR bw/WD P/ca/VONE PatentedAug. 9, 1949 .stares Param crei-cr:

'tSEIDERULE'RUNN-ER Edward Pignone, lNew Yok,"N. Y.,'asignor 'toAmericanlueLPi-int Company,"Ix1c.,.NewYork, N.`1Y.,-a,-corporatlon ofNew York l ...application september 2, .iemfsfiama missie'.'Iheginuenton relates .toirunnersffor aslide rules .and its `novelty`consists .the .construction :and .adaptiomof lthe .parts .as will .be.more ffullyliere- .'inafter ,pointed out, .its principal .object beingtto .,lplovicle...a,runner,in .which the transparentrcursor lplate lis.held ...on .guides without .causing .any internal stresses.withintheplate The runners now in use comprise guides for slidablyengaging rthe vrsides of a slide rule to which are securely fastenedglass or transparent material panel korpan'elsbry.'f.meansaof screwspassing through the panel or ,by clamping means uwhich grip the 'glassin a'vice-like grip. 'Allthese fastening means bring pressure Aon a faceof the panel to tightlyhld 'the .opposite `face @in engagement with theguides. This sets up l.internal .stresses within the panel causing .itto break .due to excessive pressure or by expansion or contraction ofthe parts due to temperature changes.

The present invention uses substantially the same boxed construction inwhich guides are provided for slidably engaging the opposite edges of aslide rule and held in spaced relations thereto by a resilient member topromote proper engagement between one guide and one edge of the sliderule. A glass or other type of transparent plate extends across thespace between the guides and is securely held to the guides under abezel without setting up any internal stresses within the panel itself.

With this assembly the bezel exerts no pressure on the panel and thebevelled edge of each end of the plate is held under a bezel carried bythe guides by arms extending laterally from the bezel embracing thelongitudinal side edges. With ,-1

this construction the panel is lightly but securely held in positionwithout any compression strains being exerted thereon.

The foregoing and other features of my invention will now be describedin connection with the accompanying drawing forming part of thisspeciiication in which I have shown my invention in its preferred form,after which I shall point out in the claims those features which Ibelieve to be new and of my own invention.

In the drawings, Figure 1 is an enlarged plan view of a slide embodyingan approved form of my invention.

Fig. 2 is a side View thereof.

Figure 3 is a cross section through line 3 3,

Figure 1.

Figure 4 is a modification which I may employ. In the carrying out of myinvention I provide a transparent plate II, preferably made of glass,

but I do not wish to limit myself to that mate- 55 rial, .rectangular:in .shape .with .the -ends thereof '.bevelled :as .shown .at I2. dOnfboth ,longitudinal edges I provide a plurality of notches I3 located.down from the =bevelled edges I2. A =cursor :line 1.I`4 lisAetchedorground -on the vupperfsurface unidway btween `the'zlongitudinely side edges.

V'.llhis .plate @is Aheld at each end in contact 'with `two Lguides 2 I,by bezels x3|.. The vbezel f3! is provided `with :a `bevelled surfaceto Iiit complemenitary with the bevel .-I2 o'f the plate. Extending.laterally fromeach .end of the bezel 3| Y.I :provide .arms 32 :havingon the Yends thereof Eextensions 33 `extending inwardly towardseachother :and spaced to renter lthe :notches 'I=3 of the `plate IrI..Qn the extreme -ends `of V-the bezel I l:provide Afholes V:threwghwhich screws =34 may pass 'Ito ifasteh the bezelrto-theguide.

.To assemble the iplate fII to the iguitie 2|., fthe extensions 33 ofthe arms 32 are placed in the notches I3 in the longitudinal edges ofthe plate, with the bevel I2 of the plate II fitting under the bezel.When the screws 34 are driven home, the plate is held in positiveposition on the guide without any compression forces acting on the plateto cause it to fracture or break.

When two plates are used as shown in detail in Figures l, 2 and 3, theguides are a, trifle thicker than the thickness of the slide rule onwhich it is to run. To keep the slide in spaced relation to the rule Iprovide a resilient member 25 which is fastened to the guide by means ofscrew 26 located in the center of the resilient member.

When one plate is used, the construction shown in Figure 4 is used. Tokeep the runner on the slide rule, I provide a projection 28 as shownadapted to slide in a slot in the edge of the slide rule provided forthe purpose.

It will be readily apparent from the above description that by properplacement of the notches I3 the bevel I2 of the plate is held snuglyunder the bezel thereby causing no internal stresses to be set up withinthe plate. This structure prevents entirely the breakage of the platewhen the screws are tightened in the structures heretofore on the marketwhile making adjustment of the indicator. It is further pointed out thatwith this new construction there is no pressure exerted either on thesurface of the plate or any of the four edges.

With this simple construction less material is used in the manufactureand the stamping and binding dies are not complicated with less timeconsumed in actual stamping operation per piece, therefore less cost.

3 I wish it distinctly understood that my slide :rule runner hereinillustrated and described is :in the form in which I desire to constructit and that changes or variations may be made as may Ebe convenientwithout departing from the salient features of my invention and Itherefore intend the following claims to cover such modifications asnaturally Vfall within the lines of invention.

I claim:

1. A slide rule runner, comprising spaced guides for slidably engagingopposite edges .of a

slide rule, each provided with a bezel and two` laterally extending armsprojecting from substantially the end of the' bezel,a transparent plateextending across the space between the guides having its two end edgesbeveled and two longitudinal edges at right angles to the plane of theplate and provided with a plurality of notches in the longitudinaledges, means carried by the arms for engaging thevnotches and holdlngthe beveled edge of the plate within the bezel without any compressionstrain on the face of the plate.

2. A slide rule runner, comprising spaced guides for slidably engagingopposite edgesvof a l, slide rule, a bezel provided'with two laterallyextending arms located one at each end of the bezel and having 'inwardprojections` at substantially rightangles to the arms, means forsecurely fastening the bezel to the guides, a transparent plateextending across the space between the fguides having its two endl edgesbeveled on an Aangle to t the angle of the bezel and two longi- .tudinaledges at right angles to the plane of the plate, and provided with aVplurality of notches in the longitudinal edgesl of the plate spaceddown from the ends of the plate and adapted to receive `the inwardlyprojecting portions of the arms. y

'from the beveled edges, a bezel attached to the guides provided withlaterally extending arms to embrace the notched edges to hold a bevel ofthe plate'under the bezel without compression of the plate.

4. A slide rule runner comprising spaced guides for slidably engaginglopposite edges of a Aslide rule, transparent plate having a cursor linemid-'way the longitudinal edges, said plate being substantiallyrectangular in shape with the end edges beveled the longitudinal edgesbeing substantially at right angles to the plane of the plate and aplurality of notches in the longitudinal edges spaced away from thecorners of the plate, a bezel provided with laterally extending arms,means for fastening the bezel to the guides to hold thearms in thenotches whereby the bevel of the plate is held withiny the bezel withoutcompression on the plane of the plate.

'EDWARD H. PIGNONE.

REFERENCES CITED The following references yare of record in the ille ofthis patent:

UNITED STATES PATENTS Number Name Date 2,407,338 Kleling Sept. 10, 1946

